ARM: dts: rockchip: add #sound-dai-cells to Cortex-A9 i2s

The Rockchip i2s always just requires a sound-dail-cells value of 0,
so add them to the core soc dtsi for convenience.
Signed-off-by: Heiko Stuebner <heiko.stuebner@bq.com>

arch/arm/boot/dts/rk3066a.dtsi

@@ -71,6 +71,7 @@ i2s0: i2s@10118000 {
 		clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>;
 		rockchip,playback-channels = <8>;
 		rockchip,capture-channels = <2>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 	};
 
@@ -88,6 +89,7 @@ i2s1: i2s@1011a000 {
 		clocks = <&cru HCLK_I2S1>, <&cru SCLK_I2S1>;
 		rockchip,playback-channels = <2>;
 		rockchip,capture-channels = <2>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 	};
 
@@ -105,6 +107,7 @@ i2s2: i2s@1011c000 {
 		clocks = <&cru HCLK_I2S2>, <&cru SCLK_I2S2>;
 		rockchip,playback-channels = <2>;
 		rockchip,capture-channels = <2>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 	};
 

arch/arm/boot/dts/rk3188.dtsi

@@ -139,6 +139,7 @@ i2s0: i2s@1011a000 {
 		clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>;
 		rockchip,playback-channels = <2>;
 		rockchip,capture-channels = <2>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 	};